Which of the following structures help the egg reach the fallopian tubes during ovulation?
a. Corpus luteum
b. Fimbrae
c. Endometrium
d. Oviducts
b. Fimbrae
The fimbrae—finger-like structures at the ends of the oviducts (also called fallopian tubes), help the egg into the opening of the tubes.
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Which of the following statements about plant tissue culture is false?
A. Virus-free crop species can be propagated by culturing meristems. B. Individual cells can give rise to whole plants through tissue cultures. C. Synthetic hormones can be used to selectively promote root or shoot formation. D. Callus tissue can only form roots, not shoots. E. A callus is a mass of undifferentiated cells.
The brown color of smog comes from light reflecting off of which substance in the atmosphere?
a. carbon dioxide b. sulfur compounds c. organic molecules d. mercury e. nitric oxide
In estimating the effect of price on sales, what is likely to be a confounding factor that one would at best have only a proxy variable for?
A. Brand awareness B. Month C. Sales D. Price
GM foods are controversial for many reasons. Which of the following does not represent a controversy between advocates and critics of GM foods?
A) GM foods cause disease in consumers. B) GM foods have an unknown impact on consumers. C) GM foods have an unknown impact on the environment. D) GM foods increase yields on farm land.